Re: [ANN] unionfs patchset-11 release

Fabian Keil <freebsd-listen_at_fabiankeil.de> wrote:

> Daichi GOTO <daichi_at_freebsd.org> wrote:
> 
> > Fabian Keil wrote:

> > > I got a different panic on
> > > FreeBSD TP51.local 6.1-RC FreeBSD 6.1-RC #22: Wed Apr 26 13:25:57 CEST 2006
> > > after mounting an empty directory above /usr/src,
> > > applying a patch and using find's -type f option shortly afterwards
> > > to show the files in the directory on top: 

> > We tried as follow, but we could not get the same error :(
> > It looks very fine.

> I didn't give you enough information, sorry.
> 
> What I'm doing is:
> 
> fk_at_TP51 ~ $mkdir /tmp/unionfs-src/
> fk_at_TP51 ~ $mount_unionfs /tmp/unionfs-src /usr/src
> fk_at_TP51 ~ $cd /usr/src
> fk_at_TP51 /usr/src $patch -p1 < ~/test/combi.patch
> fk_at_TP51 /usr/src $find /tmp/unionfs-src/ -type f
> [Panic]
> 
> ~/test/combi.patch changes about twenty files.
> 
> I'm not sure if it's important, but /usr was mounted
> readonly and /tmp is a different file system.
> 
> My kernel has options WITNESS enabled.
> 
> The last step doesn't seem to be the only way to
> get a problem, I tried the first four steps again
> and umount /usr/src resulted in a reboot.
> 
> I was running Xorg and didn't get a panic, but I'll
> try again without Xorg, to see if it's the same problem.

OK, I guess it's the same problem:

panic: initiate_write_filepage: dir inum 0 != new 8482
KDB: enter: panic
Locked vnodes

0xc359ddd0: tag syncer, type VNON
    usecount 1, writecount 0, refcount 2 mountedhere 0
    flags ()
     lock type syncer: EXCL (count 1) by thread 0xc334ec00 (pid 41)

0xc393a880: tag ufs, type VDIR  
    usecount 1, writecount 0, refcount 3 mountedhere 0
    flags ()                    
    v_object 0xc3746e70 ref 0 pages 0
     lock type ufs: EXCL (count 1) by thread 0xc334ec00 (pid 41)
        ino 8469, on dev ad0s3e
exclusive sleep mutex Softdep Lock r = 0 (0xc07839c0) locked _at_ /usr/src/sys/ufs/ffs/ffs_softdep.c:3730
exclusive sleep mutex Giant r = 0 (0xc072f640) locked _at_ /usr/src/sys/kern/vfs_subr.c:1608
Locked vnodes

0xc359ddd0: tag syncer, type VNON
    usecount 1, writecount 0, refcount 2 mountedhere 0
    flags ()
     lock type syncer: EXCL (count 1) by thread 0xc334ec00 (pid 41)

0xc393a880: tag ufs, type VDIR
    usecount 1, writecount 0, refcount 3 mountedhere 0
    flags ()
    v_object 0xc3746e70 ref 0 pages 0
     lock type ufs: EXCL (count 1) by thread 0xc334ec00 (pid 41)
        ino 8469, on dev ad0s3e
panic: from debugger
Uptime: 2m14s
Dumping 511 MB (2 chunks)
  chunk 0: 1MB (159 pages) ... ok
  chunk 1: 511MB (130656 pages) 495 479 463 447 431 415 399 383 367 351 335 319 303 287 271 255 239 223 207 191 175 159 143 127 111 95 79 63 47 31 15

#0  doadump () at pcpu.h:165
165     pcpu.h: No such file or directory.
        in pcpu.h
(kgdb) where
#0  doadump () at pcpu.h:165
#1  0xc054a865 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:402
#2  0xc054ab27 in panic (fmt=0xc06c9423 "from debugger") at /usr/src/sys/kern/kern_shutdown.c:558
#3  0xc047f523 in db_panic (addr=-1068086451, have_addr=0, count=-1, modif=0xd564b8d8 "") at /usr/src/sys/ddb/db_command.c:438
#4  0xc047f49c in db_command (last_cmdp=0xc072b3e4, cmd_table=0x0, aux_cmd_tablep=0xc06f28c4, aux_cmd_tablep_end=0xc06f28c8)
    at /usr/src/sys/ddb/db_command.c:350
#5  0xc047f58d in db_command_loop () at /usr/src/sys/ddb/db_command.c:458
#6  0xc048143d in db_trap (type=3, code=0) at /usr/src/sys/ddb/db_main.c:221
#7  0xc0564dd7 in kdb_trap (type=0, code=0, tf=0xd564ba24) at /usr/src/sys/kern/subr_kdb.c:473
#8  0xc069e4d2 in trap (frame=
      {tf_fs = -1066532856, tf_es = 40, tf_ds = -714866648, tf_edi = 1, tf_esi = -1066511478, tf_ebp = -714818964, tf_isp = -714818992, tf_ebx = -714818908, tf_edx = 0, tf_ecx = -1056878592, tf_eax = 18, tf_trapno = 3, tf_err = 0, tf_eip = -1068086451, tf_cs = 32, tf_eflags = 642, tf_esp = -1066558175, tf_ss = -1066564882}) at /usr/src/sys/i386/i386/trap.c:593
#9  0xc068feda in calltrap () at /usr/src/sys/i386/i386/exception.s:139
#10 0xc0564b4d in kdb_enter (msg=0x12 <Address 0x12 out of bounds>) at cpufunc.h:60
#11 0xc054aabf in panic (fmt=0xc06e538a "%s: dir inum %d != new %d") at /usr/src/sys/kern/kern_shutdown.c:542
#12 0xc0634021 in initiate_write_filepage (pagedep=0xc354bc00, bp=0xcd838268) at /usr/src/sys/ufs/ffs/ffs_softdep.c:3834
#13 0xc0633d1c in softdep_disk_io_initiation (bp=0xcd838268) at /usr/src/sys/ufs/ffs/ffs_softdep.c:3740
#14 0xc063c8c4 in ffs_geom_strategy (bo=0xc358aa50, bp=0xcd838268) at buf.h:422
#15 0xc0648db7 in ufs_strategy (ap=0x12) at /usr/src/sys/ufs/ufs/ufs_vnops.c:1942
#16 0xc06b47c8 in VOP_STRATEGY_APV (vop=0xc0719380, a=0xd564bb68) at vnode_if.c:1796
#17 0xc059965c in bufstrategy (bo=0xc393a940, bp=0x12) at vnode_if.h:928
#18 0xc05946e6 in bufwrite (bp=0xcd838268) at buf.h:415
#19 0xc0594c31 in bawrite (bp=0x12) at buf.h:399
#20 0xc063cb82 in ffs_syncvnode (vp=0xc393a880, waitfor=3) at /usr/src/sys/ufs/ffs/ffs_vnops.c:256
#21 0xc063b753 in ffs_sync (mp=0xc352b400, waitfor=3, td=0xc334ec00) at /usr/src/sys/ufs/ffs/ffs_vfsops.c:1143
#22 0xc05a7f42 in sync_fsync (ap=0x0) at /usr/src/sys/kern/vfs_subr.c:3086
#23 0xc06b416c in VOP_FSYNC_APV (vop=0x12, a=0x0) at vnode_if.c:1020
#24 0xc05a59d6 in sync_vnode (bo=0xc359de90, td=0xc334ec00) at vnode_if.h:537
#25 0xc05a5cbf in sched_sync () at /usr/src/sys/kern/vfs_subr.c:1676

Before I got the panic I unmounted the layer above /usr/src
and used mount to show the result. There were perhaps 5 seconds
between umount /usr/src and the panic.

Another thing which could be significant or not:
After my last mail I closed Xorg and tried to reproduce the
panic two times, but couldn't. After a reboot the panic
occurred right after the first attempt.

Fabian
-- 
http://www.fabiankeil.de/